This part is a kind of semiconductor called BC237B.

Function of this product has NPN SILICON PLANAR EPITAXIAL TRANSISTORS.

Manufacturers : CDIL

Image and pinout :

Some of the text within the PDF file :

Continental Device India Limited An ISO/TS 16949, ISO 9001 and ISO 14001 Certified Company NPN SILICON PLANAR EPITAXIAL TRANSISTORS CB E BC237,238, A,B,C BC239, B,C TO-92 Plastic Package For Lead Free Parts, Device Part # will be Prefixed with "T" Amplifier Transistors ABSOLUTE MAXIMUM RATINGS (Ta=25ºC) DESCRIPTION SYMBOL Collector Emitter Voltage VCEO Collector Emitter Voltage Emitter Base Voltage VCES VEBO Collector Current Continuous IC Power Dissipation at Ta=25ºC PD Derate Above 25ºC Power Dissipation at Tc=25ºC PD Derate Above 25ºC Operating And Storage Junction Temperature Range Tj, Tstg BC237 45 50 6.0 BC238 25 30 5.0 100 350 2.8 1.0 8.0 - 55 to +150 THERMAL RESISTANCE Junction to Ambient in free air Junction to Case Rth (j-a) Rth (j-c) 357 125 ELECTR [ ... ]

BC237B PDF Datasheet Download